Yeah, format's never really concerned me personally. I reread books so seldom that I just don't much care if I have access to it down the road. So it's pretty moot for me.
I like the flexibility of having a Kindle App on various machines so I don't have to always have one device to read the book(s) I'm currently reading, but that's about it. I don't worry about losing access to the books if the Kindle fails down the road etc.
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